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Problem

What grit for sanding plaster walls?

Plaster walls can show scratches or uneven repair edges after sanding.

paint primer dry sanding scratches
Answer

For plaster walls, use 120 or 150 on high ridges, then 180 or 220 before primer.

Why it happens
Plaster and repair compound need enough grit to level ridges, then finer sanding before primer.
Recommended grit
Use 120 or 150 for leveling hard repair areas, then 180 or 220 before primer.
Wet or dry
Dry.
Success check
The repair edge blends smoothly and is ready for primer.

What to do

  1. Confirm the repair material is dry.
  2. Use 120 or 150 only for high ridges.
  3. Refine with 180 or 220.
  4. Remove dust before primer.
Avoid: Do not keep sanding after the repair is flush with the wall.

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